Scientists are unsure what causes ADHD but heredity plays a big role
Most commonly diagnosed disorder in children
Most common symptoms include but are not limited to: difficulty paying attention to details, easily distracted, squirming while seated, talking exxesively, and difficulty completing tasks and assignments
The two most commonly used medications for ADHD are Ritalin and Adderall. They don't cure ADHD but they calm the symptoms
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http://www.nimh.nih.gov/health/publications/attention-deficit-hyperactivity-disorder/complete-index.shtml